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SSE2 functions for the fancy upsampler.

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~5-10% faster.
Heavy 8bit arithmetic trickery!
Patch by Somnath Banerjee (somnath at google dot com)

Change-Id: I9fd2c511d9f631e9cf4b008c46127b49fb527b47
This commit is contained in:
Pascal Massimino
2011-07-07 16:50:04 -07:00
parent a06bbe2e80
commit e291fae0fc
7 changed files with 332 additions and 94 deletions
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16
src/dec/webpi.h
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@ -57,6 +57,22 @@ struct WebPDecParams {
// Should be called first, before any use of the WebPDecParams object.
void WebPResetDecParams(WebPDecParams* const params);
//------------------------------------------------------------------------------
// Upsampler function to overwrite fancy upsampler.
typedef void (*WebPUpsampleLinePairFunc)(
const uint8_t* top_y, const uint8_t* bottom_y,
const uint8_t* top_u, const uint8_t* top_v,
const uint8_t* cur_u, const uint8_t* cur_v,
uint8_t* top_dst, uint8_t* bottom_dst, int len);
// Upsampler functions to be used to convert YUV to RGB(A) modes
extern WebPUpsampleLinePairFunc WebPUpsamplers[MODE_BGRA + 1];
extern WebPUpsampleLinePairFunc WebPUpsamplersKeepAlpha[MODE_BGRA + 1];
// Initializes SSE2 version of the fancy upsamplers.
void WebPInitUpsamplersSSE2(void);
//------------------------------------------------------------------------------
// Misc utils